Trying to access Quilters Newslettter on my iPad downloaded the app on newstand but won't accept any password I put in..so

If you are not already subscribed to the digital version of the magazine, then you can subscribe in the app by clicking the Subscribe button at the top of the Catalog screen.  When you do that, you will be taken through the in-app purchasing process to purchase a subscription, which will require you to enter your iTunes account password.  Once you have subscribed, you will get access to the current issue and all future issues that fall into the time period of your subscription.

For back issues, you will need to purchase them via single-issue purchases.  You can do that by clicking the Purchase button that appears in the login window.  Clicking that Purchase button will take you through the in-app purchasing process and give you access to the single issue of the magazine.